Thomas crawford dennison



(No Model.)

T. G. DENNISOE.

DRIVING BAND. 6 N0. 556,663. P6666666 6666.17, 1896.

*NMw:

; IIUINITE'D STATES "PATENT 'Orrrcn;

THOMAS oanwronnnnumson, or} QAMARU, NEW ZEALAN-T).

DR lVlNGf-BAND.

1i ysrncirxcs'rion forming part of Letters Patent No; 556,663, datedMarch 17,18 961 Application filed December 13, 1895. Serial No. 572,041.(No model.) Patented in England October 23, 1396,1lo. 19,971.

To all whomiit may concern.-

Be it known that I, THOMAS CRAWFORD DENNISON, a subject of the Queen'ofGreat Britain, residing at Oamaru, NewZealand,

haye'inventeda' new and useful Improve ment in Driving-Bands, (for whichI have obtained Letters Patent in Great Britain, No. 19,971, hearing.date of October 23, 1895,) of which the following is-a specification.

My invention relates to an improvement in belts or bandsfused fordriving machinery, and more especially to bands used as substitutes forthe pitch-chains now ordinarily used, in combination with suitablecorre- 5 and other velocipedesg and theobjects of my invention are tomake such driving belts or hands so that they are very light, strong,flexible and durable, while they cannot stretch and are not liable toslip, and are cleaner than. chains, no lubricatingoil being required. Iattain these objects by the means illustrated in the accompanyingdrawings, in whi 2 5' Figure 1 represents part of a driving-band,

showing the method of its construction. Fig. 2 is a transverse section,and Fig. 3 an edge view. .Fig. 4 is a section showingthe band passinground a pulley, and Fig. 5 a trans- 0 verse section .on a larger scale.Similar letters refer to similar parts in diiferent figures. v

I take a sufiicient length of line, strong, metallic wire, preferablysteel, such as is well known as piano wire, and I wind this wire'i'nparallel and adjoining coils round a drumjor wheel of the properdiameter, so that the coils for a flat endless ribbons of the requiredwidth. and length, andl attach the two ends ofthewire to the coil bysoldering or other equivalent means, as illustrated in Fig. 1, where 2)represents one end of the coil bent across and, soldered to the rest ofthe band a.

the

kept in their proper. position by means of a suitable solder ofsufficient flexibility applied to their whole surface or at intervals.

The flexible metallic band, made as described, after having'becn removedfrom the drum or wheel round which it has been wound, is wound roundwitha strip or strips spending chain-wheels,for driving bicycles Theparallel coils of the wire band a are tion.

lVhere vulcanized instead of plain indiarubber is used for the exteriorcoating, 1 first coat the wire coilwith a thin coating of alu m inum, sothat the wire coil may not be injuriously afiected by any sulphur orother injurious ingredients present in the india-rulr her, or the solderused may be of aluminum or a compound of aluminuim'or instead ofaluminum other substances unaffected by sulphur may be used.

The india-rubber (Z ismade of such shape in. cross-sectionas to fit incorresponding grooves round thcperipheries of the pulleys, round whichthe endless band passes, as shown iusection at c, Fig. 4, and such anarrangement forms an excellent substitute for the ordinarynhain wheelsand pitch-chains used in cycles, and for other purposes of the likekind.

p of hard canvas c and is finally coated with plain: or vulcanizedindia-rubber, as shown at d in thcfigures, of suitable thickness andsec- In order to increase the grip, the sides of the M grooves may bemade waved or undulating. Bands made according to my invention areextremely light and flexible and at the same Y purposes for whichflexible belts or hands are ordinarily used. I

\Vhat I claim as my invention, and desire to secure byL'etters Patent,is

1. An endless driving-band for bicycles and the like, composed of acentral core formed.

of a continuous small tempered-steel wire wound in a plurality of coilsadjacent to each other, and the ends of said wire bent transverselyacross the said coils and soldered thereto; a suitable solder interposedbetween said coils and binding the same together; a continuous strip ofcanvas wound spirally upon said central core; and a thick coating ofindia-rubber inclosing the whole, substantially as described.

'2. An endless driving-band for bicycles and the like, composed of acentral core formed of a continuous small tempered-steel wire wound in apluralityof coils adjacent to each other, and the ends of said wire benttrans- 2 55e,ees

versely across the said coils and soldered thereto; a suitable solderinterposed between said coils and binding the same together; acontinuous strip of canvas wound spirally 5 upon said central core'; anda thick coating of india-rubber inclosing the whole; the said bandbeingof greater cross-section upon its outer circumference than upon itsinner cireumference; to fit in a corresponding1y- 1o grooved Wheel andthus insure the greatest friction against the sides of said groove aswell as against the bottom thereof, substantially as described.

THOMAS CRAWFORD DENNISON.

Witnesses:

ARTHUR E. EDWARDS, W. E. SYKES.

